Just wait. That’s what snow plow truck drivers are doing this morning, as are many other people expecting a lot of snow. It’s on the way.

That’s the latest from the National Weather Service, which says that while snow will likely mix with rain and snow part of today in the Hunterdon area, by late in the day it will be all snow. And that’s when the white stuff will begin piling up.

A Winter Storm Warning will be in effect from 3 p.m. Friday until 6 a.m. Saturday. According to the NWS, Hunterdon could end up with 4 to 10 inches of snow, possibly more. It all depends on how soon colder area moves in as the storm moves north and east of New Jersey.

At the height of the storm tonight, snow will fall at the rate of 1 to 2 inches an hour, and winds will pick up from the north, causing blowing and drifting.

Snow plow contractors hired by the state to clear highways have been on stand-by in various locations around the region, some since the middle of the night. State, county and municipal road crews are out spreading salt. And both public agencies and private companies are making last-minute checks and repairs to equipment, preparing for what is likely to be a long night of moving snow.

The Friday evening commute will probably be treacherous, especially around about 6 p.m., NWS warned.

According to the service, the rain-snow line had not moved much so far this morning, running across New Jersey about midway between route 78, which runs through Hunterdon, and Route 95, which goes through Mercer.